*{
  padding: 0;
  margin: 0;
  overflow: hidden;
}
*,*:after,*:before{
  box-sizing:border-box;
}
ol,ul{
  list-style: none;
}

body > #page{
  display: flex;
  flex-wrap: wrap;
}
body > #page  section{
  width: 50vw;
  height: 50vh;
  border: 1px solid #999;

}